[Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

[fateme91]

[Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

Hi dear friends

I need to know about ADS1146 . I have datasheet but it's hard to underestand clock times.

Can u HELP me plzzz?

Datasheet: View attachment ADS1146-AtoD16bits.pdf

 

[milan.rajik]

Re: [Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

Everything is given clearly in page 10. What you didn't understand ?

 

[fateme91]

Re: [Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

Why do we have 8 bits? isn't it 16 bits?
what is serial data?
how spi works? how send and recieve data?

Thanks alot.

 

[milan.rajik]

Re: [Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

Are you using hardware SPI or Software SPI.

fclk (SPI Clock) depends upon FOSC of PIC if PIC microcontroller is used. What microcontroller and what crystal frequency are you using ?

If FOSC is 4 MHz then if Fosc/64 is selected for SPI Clock then fclk will be 4 MHz / 64 = 62500 and tsclk will be 16 us. All the timings on page 10 doesn't exceed 1 us. As your SPI clock period will be 16 us you don't have to worry about the timings.

The timings shown in table 10 are minimum required. It can exceed.

Post your circuit.

If you use Software SPI then just use 2 us delays.

Yes data is 16 bits. Page 27 shows how to retrieve data.

 

[fateme91]

Re: [Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

1. I have to use hardware SPI. How should i connect it to my micro and my Ic? micro will be ATmega16/32 .
The crystal Freq. may be 8MHz.

2. What does it mean Input Data positive or negative? Where are they used?
3. What is it? The voltage Reference?

I will ask more questions !
Thanks alot.

 

[milan.rajik]

Re: [Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

The data input to ADC.

Refrence voltage for ADC. If it is 16 bit ADC and if your provide a refrence of 5V then 5V adc input will produce 0xFFFF as result.

 

[fateme91]

Re: [Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

Can u show me a circuit of AdS1146 And a pt100 connection ?
How do we use ADS1146 with pt100 ?

 

[paulfjujo]

Re: [Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

hello,

maybe ADS1146 is not the right part to do that,
the others seems specilized for RTD measure..
provide a constant current (programmable)
ie with 1mA into Pt100 =>
100mV at 0°C
about 138mV at 100°C

EXCITATION CURRENT SOURCE DACS
The ADS1147 and ADS1148 include an onboard excitation current sources for RTD applications. For
the three- or four-wire RTD applications

The ADS1147 and ADS1148 have two programmable current source DACs that can be used for
sensor excitation. The IMAG bits control the magnitude of the excitation current. The IDACs require
the internal reference to be on.
000 = off (default)
001 = 50mA
010 = 100mA
011 = 250mA
100 = 500mA
101 = 750mA
110 = 1000mA
111 = 1500mA

 

[fateme91]

Re: [Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

Hi

How do we connect an ADS1146 to a micro like ATMEGA16 with SPI interface?
How do we connect an ADS1146 to a micro like ATMEGA16 with SPI interface?

 

[FvM]

Re: [Moved] Underestanding about " ADS1146 " : a analog to digital 16 bits converter

How do we connect an ADS1146 to a micro like ATMEGA16 with SPI interface?

SPI is a four wire interface (SCK, MOSI, MISO, SS in the original Motorola terminology, respectively SCK, DIN, DOUT, nCS ). All four wires must be connected to the processor and the SPI controller setup as master with correct SPI mode according to the datasheet.